#all_div div{
    float: left;
}
#all_div{
    width: 100%;
}
#all_div_top{
    width: 100%;
    height: 50px;
    background-color: #00b7ee;
}
#all_div_center{
    width: 100%;
    height: 600px;



}
#all_div_center_left{
    width: 15%;
    height: 600px;
    border-right: 2px dashed #726E6D;
    padding:10px;


}
#all_div_center_center{
    width: 60%;
    height: 600px;
    border-right: 2px dashed #726E6D;
    padding:10px;


}
#all_div_center_right{
    width: 23%;
    height: 600px;
    padding:10px;


}